Sealed honeycomb structure and device for cleaning exhaust

Abstract

A sealed honeycomb structure which can suppress increase of pressure loss and improve durability favorably is disclosed. A sealed honeycomb structure 100 including includes a honeycomb structure having porous walls dividedly forming inlet cells and outlet cells, an outlet side sealing portion, and an inlet side sealing portion, wherein an opening area of the inlet cell is larger than an opening area of an outlet cell on a cross-section of the honeycomb structure, wherein at least one outlet cell is a reinforced cell where a reinforcing part for reinforcing the outlet cell is formed at at least one corner portion at which the walls on a cross-section vertical to an extending direction of the cell cross each other, and wherein the inlet cell is a non-reinforced cell where the reinforcing part is not formed at all the corner portions at which the walls on the cross-section vertical to the extending direction of the cell cross each other.

The invention claimed is: 
     
       1. A sealed honeycomb structure comprising:
 porous walls dividedly forming a plurality of cells extending from an end surface of an inlet side to an end surface of an outlet side, the plurality of cells being a plurality of fluid channels; 
 an outlet side sealing portion mounted at openings of predetermined cells in the end surface of the outlet side so as to form inlet cells where the end surface of the inlet side is open and the end surface of the outlet side is sealed; and 
 an inlet side sealing portion mounted at openings of remaining cells in the end surface of the inlet side so as to form outlet cells where the end surface of the outlet side is open and the end surface of the inlet side is sealed, 
 wherein the inlet cells and the outlet cells are disposed alternately across the walls, and an opening area of the inlet cells on a cross-section vertical to an extending direction of the inlet cells is larger than that of the outlet cells on the cross-section vertical to the extending direction of the outlet cells, 
 wherein at least one cell among the outlet cells is a reinforced cell where a reinforcing part for reinforcing the outlet cells is formed at at least one corner portion at which the walls on the cross-section vertical to the extending direction of the outlet cells cross each other, 
 wherein the inlet cells are provided with a reinforcing part for reinforcing the inlet cells at at least one corner portion at which the walls on the cross-section vertical to the extending direction of the inlet cells cross each other, and 
 wherein the total number of the corner portions reinforcing the inlet cells is smaller than the total number of the corner portions reinforcing the outlet cells. 
 
     
     
       2. The sealed honeycomb structure of  claim 1 , wherein the reinforced cell comprises a reinforced corner portion at which the reinforcing part is formed and a non-reinforced corner portion at which the reinforcing part is not formed. 
     
     
       3. The sealed honeycomb structure of  claim 1 , wherein the reinforced cell is configured that the reinforcing parts are formed at all the corner portions of the reinforced cell. 
     
     
       4. The sealed honeycomb structure of  claim 1 , wherein an opening shape of the inlet cells on the cross-section vertical to the extending direction of the inlet cells is selected from the group consisting of triangle, quadrangle, hexagon and octagon, and an opening shape of the outlet cells on the cross-section vertical to the extending direction of the outlet cells is selected from the group consisting of triangle, quadrangle, hexagon and octagon. 
     
     
       5. The sealed honeycomb structure of  claim 1 , wherein a ratio of an intersecting distance of an intersecting part of the walls to an average thickness of the wall without the reinforcing part is within a range of 1.6 to 14.0, and 
       wherein the intersecting distance of the intersecting part of the walls is a distance from a surface of the reinforcing part of the reinforce cell to a surface of another cell disposed across an intersecting point of the walls dividedly forming the reinforce cells. 
     
     
       6. The sealed honeycomb structure of  claim 1 , wherein each reinforcing part occupies 0.05 to 20 of an area of an opening portion without the reinforcing part on the cross-section vertical to the extending direction of the cell.